Derive mode from DSN function

- Add headers in all files
- Minor field name changes

src/Query/Patch.php

@@ -1,8 +1,15 @@
-<?php declare(strict_types=1);
+<?php
+/**
+ * @author Daniel J. Summers <daniel@bitbadger.solutions>
+ * @license MIT
+ */
+
+declare(strict_types=1);
 
 namespace BitBadger\PDODocument\Query;
 
 use BitBadger\PDODocument\{Configuration, DocumentException, Field, FieldMatch, Mode, Query};
+use Exception;
 
 /**
  * Queries to perform partial updates on documents
@@ -15,14 +22,13 @@ class Patch
      * @param string $tableName The name of the table in which documents should be patched
      * @param string $whereClause The body of the WHERE clause to use in the UPDATE statement
      * @return string The UPDATE statement to perform the patch
-     * @throws DocumentException If the database mode has not been set
+     * @throws Exception If the database mode has not been set
      */
     public static function update(string $tableName, string $whereClause): string
     {
-        $setValue = match (Configuration::$mode) {
+        $setValue = match (Configuration::mode('make patch statement')) {
             Mode::PgSQL  => 'data || :data',
-            Mode::SQLite => 'json_patch(data, json(:data))',
-            default      => throw new DocumentException('Database mode not set; cannot make patch statement')
+            Mode::SQLite => 'json_patch(data, json(:data))'
         };
         return "UPDATE $tableName SET data = $setValue WHERE $whereClause";
     }